Image of air locks and a fire door with pipes from the tailings and compressed air. The fire doors are installed to be locked in case of fire. The drain pipes were a necessity when miners would fill the worked-out areas with tailings.

Image of the Butte hoist compressor plant during its dismantling to make way for the new open put. It was located in the High Ore Mine yard. This plant furnished compressed air for all of the underground mines.

An image in the Speculator-Granite Mountain Mines, which illustrates a drilling platform with a miner and a buzzie drill, in addition to a compressed air hose. It is an example of dry drilling, which was against the safety codes.